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Sexual Precocity in a 16-Month-Old
* X; p. G4 S b. \- K6 SBoy Induced by Indirect Topical5 r; m" V/ D0 w5 c; h X) A4 P6 |
Exposure to Testosterone! a$ _/ y4 Z" {' W0 S8 l) L3 ~
Samar K. Bhowmick, MD, FACE,1 Tracy Ricke, MD,2
+ Z) i5 ^# _0 f! i( a" Band Kenneth R. Rettig, MD1
l! U2 l, F/ m4 Q) k: C1 c) @Clinical Pediatrics
4 b( {: }) I$ P( j: q: C5 rVolume 46 Number 6
. i" J/ }8 O4 Q+ B# n% ~# R, ZJuly 2007 540-543& W/ b" i# A; t: c2 v, G5 a% Y
© 2007 Sage Publications1 V; B% X7 B( m9 d. r9 [
10.1177/0009922806296651
6 `& a: C0 @( Z: j6 L$ lhttp://clp.sagepub.com
' Z, A ^" H3 j( W6 _: C# s# zhosted at, \% R' o0 J3 q! M7 z8 P' L
http://online.sagepub.com
' i- H$ l9 g7 w( RPrecocious puberty in boys, central or peripheral,
, _+ k$ _8 T4 J# F+ |! \8 ais a significant concern for physicians. Central
/ V/ Z: h3 D" }. T3 b8 Pprecocious puberty (CPP), which is mediated) F8 c& G; S; }0 O6 W$ \
through the hypothalamic pituitary gonadal axis, has& `+ I4 G) H6 f9 N5 X3 A3 B
a higher incidence of organic central nervous system- F$ G- x& \5 I; R5 i( e' `; ~
lesions in boys.1,2 Virilization in boys, as manifested
9 u, s& V5 T% H, s& I, q7 R$ Zby enlargement of the penis, development of pubic& F8 x" I6 a' F" L% W
hair, and facial acne without enlargement of testi-
# |4 J0 W* x& ?; ^* dcles, suggests peripheral or pseudopuberty.1-3 We8 d0 e' P& { m# A, W5 z: \; V" a0 v
report a 16-month-old boy who presented with the
5 W6 c% }3 f! B* y/ b7 Cenlargement of the phallus and pubic hair develop-1 s i4 }. s6 r% F0 J9 S
ment without testicular enlargement, which was due, m( P9 I0 \; ~& _4 ?+ ~, e
to the unintentional exposure to androgen gel used by
8 s) {; o' P, @! ^the father. The family initially concealed this infor-
' i* o" [, W X" x3 ymation, resulting in an extensive work-up for this9 M- O4 A. l* a1 ~2 h0 _
child. Given the widespread and easy availability of
0 T% S% s W3 _. N. b5 \testosterone gel and cream, we believe this is proba-3 V% N2 G# a0 P) s: V
bly more common than the rare case report in the
8 @7 U. c2 I* _1 A, `: I3 U& \& xliterature.41 c, m: _" D; f. w
Patient Report9 F2 |7 ]3 X( m0 `
A 16-month-old white child was referred to the
+ O* P. d$ l# A: i! _$ {" U- Oendocrine clinic by his pediatrician with the concern9 B) p/ |+ F" ~
of early sexual development. His mother noticed! P' Z3 z2 D1 k* m
light colored pubic hair development when he was
9 U% m& ?( x( w( o: PFrom the 1Division of Pediatric Endocrinology, 2University of
% d+ k, h, ]9 K% N5 q; USouth Alabama Medical Center, Mobile, Alabama.% v7 a- n; \) \- t
Address correspondence to: Samar K. Bhowmick, MD, FACE,* ?5 Z3 j! ^5 S% u
Professor of Pediatrics, University of South Alabama, College of
5 B2 m; c; E% [7 P, JMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
9 D8 @5 k$ I! a1 f( Le-mail: [email protected].
$ k- X7 A4 a: ]about 6 to 7 months old, which progressively became i, C) M, R/ c% N6 C
darker. She was also concerned about the enlarge-
8 L: E* X* k) ^# Sment of his penis and frequent erections. The child; [- z3 v) g6 Q2 J: [( \' i% x
was the product of a full-term normal delivery, with
4 | \ F4 E( E4 V9 }a birth weight of 7 lb 14 oz, and birth length of
% X; r( E4 H! R20 inches. He was breast-fed throughout the first year7 q- {. T0 v) n0 M7 N) S
of life and was still receiving breast milk along with
0 p& K- P- ~% f& U+ N. esolid food. He had no hospitalizations or surgery,
5 C4 m" R3 V) R5 c$ ]" `. ?and his psychosocial and psychomotor development% P& n- `, {& k- Q1 o; @3 A
was age appropriate.+ l" Y% l. L1 C# R8 _; g. P' `
The family history was remarkable for the father,; [/ M8 d8 H" v5 X
who was diagnosed with hypothyroidism at age 16,
/ f+ a& D3 u8 N: G: h" y: [$ j Jwhich was treated with thyroxine. The father’s* }' O+ u3 |. B9 ]( W
height was 6 feet, and he went through a somewhat
" U: w" ]* ^, G' _2 @early puberty and had stopped growing by age 14.
% @ H6 D: y3 [7 ]The father denied taking any other medication. The: Z) w5 z0 e% U" G3 O
child’s mother was in good health. Her menarche% ?1 B5 F) M2 U; n) }1 T' `
was at 11 years of age, and her height was at 5 feet
! Q- ~; t) d- i7 v9 j: |! p5 inches. There was no other family history of pre-
# R! q2 `5 X% J+ _% pcocious sexual development in the first-degree rela-8 v: B3 i. T6 u5 z2 h7 ?8 `4 j
tives. There were no siblings.( ^) R5 ^" s2 v8 m) H6 u9 X
Physical Examination* O/ Q4 o) l# u
The physical examination revealed a very active,
+ `8 w* _: h. {8 [playful, and healthy boy. The vital signs documented3 q' y3 V, e* N9 G. `6 G; n/ H
a blood pressure of 85/50 mm Hg, his length was
( S+ @2 R0 b6 [5 P90 cm (>97th percentile), and his weight was 14.4 kg
" @9 c6 g7 }+ U. J(also >97th percentile). The observed yearly growth
- f% X& o+ |7 }# N; g( svelocity was 30 cm (12 inches). The examination of1 A" n( b/ }, g" q
the neck revealed no thyroid enlargement., f M; b' a1 r& i- r! I
The genitourinary examination was remarkable for
# m& @1 S9 L' q( G7 P8 r5 zenlargement of the penis, with a stretched length of* {; |& W" W% ?4 b7 i1 c
8 cm and a width of 2 cm. The glans penis was very well# k1 {9 _+ W9 \' f% M" K5 q
developed. The pubic hair was Tanner II, mostly around
2 B0 F: ?) m2 o- g3 Q' B8 f! ?8 k540
6 W5 Z( G; O: {8 n: w3 x7 F% z/ `at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from$ U9 d8 ]; a0 f# T, I
the base of the phallus and was dark and curled. The" l1 N9 Q) v' \1 X
testicular volume was prepubertal at 2 mL each." B+ f+ j" m$ d% @
The skin was moist and smooth and somewhat
* Q/ V* J. _* T( J) L6 D, p3 Loily. No axillary hair was noted. There were no, n, M6 N8 e9 h$ M; g4 L
abnormal skin pigmentations or café-au-lait spots.
$ D1 u" h# r, q$ ^$ R' |Neurologic evaluation showed deep tendon reflex 2+& k m. `: s9 z1 b
bilateral and symmetrical. There was no suggestion
9 y; `) Q- \1 R1 _9 N1 j3 k! I, ^of papilledema.
- _* [& Z ~& U* Y) {Laboratory Evaluation9 r7 C" J3 K; }5 i3 {
The bone age was consistent with 28 months by
! ]' [5 D5 S9 q, B/ v) Xusing the standard of Greulich and Pyle at a chrono-9 a/ K' r5 u3 k s
logic age of 16 months (advanced).5 Chromosomal+ F- Z$ X6 h$ V }# _# a8 Z$ ?
karyotype was 46XY. The thyroid function test/ [) C1 d6 S' r
showed a free T4 of 1.69 ng/dL, and thyroid stimu-
) H- ^, {8 \0 L: M. ]( i2 Mlating hormone level was 1.3 µIU/mL (both normal).
$ u: E$ [1 N. ~( E( oThe concentrations of serum electrolytes, blood& e; l5 P9 T( v1 D
urea nitrogen, creatinine, and calcium all were1 u- \. F! Q* n
within normal range for his age. The concentration' [/ n9 v) H3 i
of serum 17-hydroxyprogesterone was 16 ng/dL" _, K3 U6 M" f' J
(normal, 3 to 90 ng/dL), androstenedione was 20
5 }) m" @. |" Vng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
! j3 k1 t8 v. s( Q6 [terone was 38 ng/dL (normal, 50 to 760 ng/dL),
/ |, e v! R' @ _& D( R7 J2 y* t' Ddesoxycorticosterone was 4.3 ng/dL (normal, 7 to
2 T2 p2 @, Q3 A& M" `8 K( j* a4 r49ng/dL), 11-desoxycortisol (specific compound S)6 c+ A' c& ^' ]- _
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-: ^- `& M8 e/ ? g# l9 W
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total0 n+ j4 k% C6 Y9 U/ z Z* h% }
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
% f0 K. p7 t' l4 R" Kand β-human chorionic gonadotropin was less than
1 E# ~9 [4 b- A/ A9 \$ o5 mIU/mL (normal <5 mIU/mL). Serum follicular7 z0 r- v- h6 _2 w7 M
stimulating hormone and leuteinizing hormone- ~7 ~$ G+ D2 i7 _- O% V. U, d
concentrations were less than 0.05 mIU/mL
5 v; X' j8 u) Z(prepubertal).
6 f/ S" q5 A( y1 N+ s/ ?The parents were notified about the laboratory' g2 t: D& s- q3 n
results and were informed that all of the tests were9 _9 I/ d, k; @: b9 I2 R5 ^! H
normal except the testosterone level was high. The
# ^* g4 P1 r( Z. \* Vfollow-up visit was arranged within a few weeks to1 m& B6 h( N( Q: ?) S$ W N
obtain testicular and abdominal sonograms; how-
0 R5 j" D! E7 Qever, the family did not return for 4 months.
( j' x: B0 C7 d) Y" ?6 `, X1 uPhysical examination at this time revealed that the
1 ?: `! T4 z3 h& j9 q' U( z5 [2 a2 pchild had grown 2.5 cm in 4 months and had gained" A: o9 q1 k* L3 H% R5 S
2 kg of weight. Physical examination remained
& W/ r8 ~$ [, X; P% @* z! q2 Cunchanged. Surprisingly, the pubic hair almost com-- o! N# ^2 o, F' L$ {: A/ r
pletely disappeared except for a few vellous hairs at/ S, O1 ~& a- t- c: a& g
the base of the phallus. Testicular volume was still 2 o' V r' V3 _+ D
mL, and the size of the penis remained unchanged.' _5 N, r& P2 ^& C5 E; y) ~9 n0 [
The mother also said that the boy was no longer hav-
( H5 c( U) Y- f. k- o0 ping frequent erections./ I) C+ o. O" X
Both parents were again questioned about use of/ i G) C ]. B% t T
any ointment/creams that they may have applied to3 c4 B* p, S; E
the child’s skin. This time the father admitted the" u7 V/ j& f7 L7 i' V5 }* S, y
Topical Testosterone Exposure / Bhowmick et al 541/ o+ f% ^% M: B" X' [8 Y
use of testosterone gel twice daily that he was apply-0 i& |# v3 X6 h
ing over his own shoulders, chest, and back area for
8 {( P, Z) E. e3 X3 Y1 [a year. The father also revealed he was embarrassed, W# L- G Y6 |
to disclose that he was using a testosterone gel pre-1 y: {: e) B% o6 T# m
scribed by his family physician for decreased libido- d5 Y6 }2 F9 O2 U P; I# C
secondary to depression./ }* A# k& d; L+ M$ a
The child slept in the same bed with parents.7 b: A, _8 V' S q
The father would hug the baby and hold him on his
8 ^3 {0 w& s6 [7 k5 z' ?3 ?chest for a considerable period of time, causing sig-; p1 w: S7 Z8 J& X, o) w( [
nificant bare skin contact between baby and father.
- Y+ X Y+ @0 e$ ?9 Q& XThe father also admitted that after the phone call,
+ L( A* p& a+ c* f2 R5 b6 P0 lwhen he learned the testosterone level in the baby: j4 \- R; I) L2 A( t7 P
was high, he then read the product information
% _) w. W8 K4 g9 B- I1 xpacket and concluded that it was most likely the rea-
) u+ {" E' N; P, c, Xson for the child’s virilization. At that time, they7 n0 Z4 X; k1 m, I
decided to put the baby in a separate bed, and the8 h( M% h4 C; c
father was not hugging him with bare skin and had( G1 P7 k7 d% Q
been using protective clothing. A repeat testosterone
, v* n3 x2 v& t6 Rtest was ordered, but the family did not go to the
8 [* d( l5 c" U ulaboratory to obtain the test.
+ z- C9 @* _% L9 |9 l8 MDiscussion
/ F; R/ ^' x( W3 QPrecocious puberty in boys is defined as secondary
. w8 M* v' I/ C# j; vsexual development before 9 years of age.1,4! O" C( i% i2 p) k
Precocious puberty is termed as central (true) when0 a2 ]8 C$ ?% d1 Q0 S$ x3 M
it is caused by the premature activation of hypo-
7 \+ e2 ^" {4 q- f. L+ |thalamic pituitary gonadal axis. CPP is more com-6 v- w0 I! i. j8 H
mon in girls than in boys.1,3 Most boys with CPP% n0 O# h2 p7 q* i
may have a central nervous system lesion that is
' x3 C" Y( d- }" j v2 B3 Oresponsible for the early activation of the hypothal-# ~% T2 m2 F. R/ x: L
amic pituitary gonadal axis.1-3 Thus, greater empha-
. {; J, j# i4 R- ]- _) Y0 @sis has been given to neuroradiologic imaging in5 A: m: |; S1 O% ]
boys with precocious puberty. In addition to viril-
; D3 M9 L$ {) J& H( @0 l" x' gization, the clinical hallmark of CPP is the symmet-1 X6 h }7 w1 X
rical testicular growth secondary to stimulation by4 k0 ^- X6 Z0 \3 P2 k9 v$ S& D
gonadotropins.1,39 t D/ Y d! p3 z+ {/ \* i
Gonadotropin-independent peripheral preco-
3 N+ ?4 N; F' \) gcious puberty in boys also results from inappropriate
% L! Y/ M6 m" kandrogenic stimulation from either endogenous or
8 U7 b7 m4 @6 D* e! n+ ~; aexogenous sources, nonpituitary gonadotropin stim-
2 c* n8 k& Z' y2 |( }4 ?ulation, and rare activating mutations.3 Virilizing- n P, M) m; P& G0 e6 O$ u
congenital adrenal hyperplasia producing excessive
3 S: t# J: G9 B) a+ jadrenal androgens is a common cause of precocious
7 ^; m5 g+ x0 k9 T) _$ |7 O. vpuberty in boys.3,4' L. [' l3 u2 O! [: ~
The most common form of congenital adrenal d: ^% W" n9 j9 a, e+ U) t) X: ~
hyperplasia is the 21-hydroxylase enzyme deficiency.9 p' A- x! R$ r: ^; G! b
The 11-β hydroxylase deficiency may also result in' F7 e2 Y1 \8 C2 }1 d
excessive adrenal androgen production, and rarely,
% X3 D' C5 j. ~3 h7 P ean adrenal tumor may also cause adrenal androgen
0 Y. o: c: T9 s7 ^excess.1,3+ { Z4 j$ A. N* S' ?
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
' y2 s/ d) h% Z- K" j8 n542 Clinical Pediatrics / Vol. 46, No. 6, July 20078 `# n( h$ r: N0 G* y, T& M& O
A unique entity of male-limited gonadotropin-
. N6 W7 ^* y1 F, y+ n; D+ sindependent precocious puberty, which is also known# ~! T% E3 C; ^" W
as testotoxicosis, may cause precocious puberty at a
4 u# [5 e* _ K4 l1 Jvery young age. The physical findings in these boys* g S! B& C& ^$ C* u
with this disorder are full pubertal development,7 Z% f9 S3 Z( S* |4 I, @
including bilateral testicular growth, similar to boys
& u, `* _: E; Y3 W q; Owith CPP. The gonadotropin levels in this disorder& W) ^' n* `" E3 O
are suppressed to prepubertal levels and do not show d; k6 i3 o( k
pubertal response of gonadotropin after gonadotropin-
3 p V& P. m7 i, y7 Z" V( ]; Vreleasing hormone stimulation. This is a sex-linked
& l% R' D+ N) jautosomal dominant disorder that affects only! z+ b6 U& o* M4 K
males; therefore, other male members of the family* ?1 B j; Q i6 \
may have similar precocious puberty.3) x. G, y9 Z3 X% P
In our patient, physical examination was incon-4 ^ V) U( H1 s4 k# @9 R0 c, I
sistent with true precocious puberty since his testi-
- P' z/ { \; Y5 @& J2 bcles were prepubertal in size. However, testotoxicosis3 r- }# C# Y. I/ y* g+ B9 q. m, P
was in the differential diagnosis because his father
$ i7 |+ t& G6 ?1 C3 Jstarted puberty somewhat early, and occasionally,2 J7 X* {/ @. Q) C% U+ V8 r1 e/ j
testicular enlargement is not that evident in the e, A) W% j' C1 Y! r7 S
beginning of this process.1 In the absence of a neg-
5 S3 L/ v* m5 W4 f7 J& ]ative initial history of androgen exposure, our
: K2 L4 w2 Z* a9 q" ]biggest concern was virilizing adrenal hyperplasia,# l( I8 [& g( `- [4 g- u
either 21-hydroxylase deficiency or 11-β hydroxylase
$ S9 Q0 [' |# s% y/ n+ |7 Ddeficiency. Those diagnoses were excluded by find-: s( k9 S/ h0 _( D* b6 a
ing the normal level of adrenal steroids.
# s# i6 s7 O6 Q# ]% N) {The diagnosis of exogenous androgens was strongly
; b4 W% ]) {$ S/ T$ J, P5 E& K6 Psuspected in a follow-up visit after 4 months because4 M' f6 }) J! j$ z! D+ A. j- f: F( f% U
the physical examination revealed the complete disap-+ t o8 u% c6 z4 M4 f$ [# Z
pearance of pubic hair, normal growth velocity, and7 p) |- v9 ~! ^- e3 _4 b/ i
decreased erections. The father admitted using a testos-
& T E) Y w, z# i) Q: cterone gel, which he concealed at first visit. He was- G2 p) K$ b% A5 k
using it rather frequently, twice a day. The Physicians’- c; z. L. ^/ R
Desk Reference, or package insert of this product, gel or4 J: ^2 D9 L$ d5 I7 [) u* V
cream, cautions about dermal testosterone transfer to
/ D: W* t& y& g s( i% `& eunprotected females through direct skin exposure.* ]* ^: |/ {3 f$ R
Serum testosterone level was found to be 2 times the% p( N2 \" v7 c5 d7 i M; Q
baseline value in those females who were exposed to
8 O6 q Q$ w( @- O* beven 15 minutes of direct skin contact with their male7 V- U- O) }2 ^3 Q H- k( S' ^% S7 b" U
partners.6 However, when a shirt covered the applica-6 N; D6 h4 t5 ^" O
tion site, this testosterone transfer was prevented.8 U. \. Z; @" u" X( |7 i
Our patient’s testosterone level was 60 ng/mL,1 D0 c6 b+ v2 R0 M( I
which was clearly high. Some studies suggest that6 ?. c7 F. y) B2 H$ e! i
dermal conversion of testosterone to dihydrotestos-. R3 W4 V/ z" X- r, b
terone, which is a more potent metabolite, is more
( W! p+ b" Z/ I- z' m+ S( N' Iactive in young children exposed to testosterone
; c1 X9 r4 N; ^# \exogenously7; however, we did not measure a dihy-
: F8 V+ u0 q, M5 b) N8 ndrotestosterone level in our patient. In addition to
0 b0 Y. u }3 c6 ^" Q+ S; Qvirilization, exposure to exogenous testosterone in8 }' n' L( T5 j; `* U8 u
children results in an increase in growth velocity and) E1 v: V; v* o& p7 Z- B/ w2 |
advanced bone age, as seen in our patient.
. T/ e0 D* c! gThe long-term effect of androgen exposure during
/ _+ ]8 g' y- pearly childhood on pubertal development and final
. x, H9 Q2 \+ t% Z1 qadult height are not fully known and always remain
' W0 A; E. s; d8 Ba concern. Children treated with short-term testos-! x7 v- H5 l3 Z) F2 n. M# Q
terone injection or topical androgen may exhibit some
1 W( x5 Y- V) R/ z6 Yacceleration of the skeletal maturation; however, after
& S/ c8 L# h, b9 y( k) ]4 Gcessation of treatment, the rate of bone maturation
# x _. b' |8 i( w/ Adecelerates and gradually returns to normal.8,9 z7 A. U# t {2 D5 P( f/ j. j* E
There are conflicting reports and controversy; m" U3 B# A$ n8 x! E
over the effect of early androgen exposure on adult
" {. x8 g- l& ]3 h4 _penile length.10,11 Some reports suggest subnormal
* ~* s8 v' u1 C5 M) Gadult penile length, apparently because of downreg-8 d. |7 c- g+ h k
ulation of androgen receptor number.10,12 However,3 C% B! A1 w# y0 q: Q
Sutherland et al13 did not find a correlation between/ k4 n8 T+ x$ ^5 J3 p
childhood testosterone exposure and reduced adult
@% k8 t( |- Dpenile length in clinical studies.- p( S3 M+ ^. ]" R( I& |3 V& h
Nonetheless, we do not believe our patient is
* s8 G3 w! m4 C* L' |going to experience any of the untoward effects from
2 T1 g) O! M4 Z9 r2 i4 P$ btestosterone exposure as mentioned earlier because
5 j$ Z3 o5 k* L4 e d& Z& Bthe exposure was not for a prolonged period of time.
6 d* K1 H. ]* A6 t+ H# h kAlthough the bone age was advanced at the time of, c, w, X' x' }# I5 q2 g
diagnosis, the child had a normal growth velocity at/ y4 J. p0 z2 b2 W
the follow-up visit. It is hoped that his final adult
: {4 s; v0 U5 \( M/ v3 W9 }' l' iheight will not be affected.
6 C8 ^ I+ o; e: F% ~Although rarely reported, the widespread avail-
4 S$ E" S5 e+ a+ rability of androgen products in our society may
1 `0 [) s5 ], ~: M. i3 Rindeed cause more virilization in male or female" M3 e$ X! a2 C1 p2 E" X8 s- A
children than one would realize. Exposure to andro-7 l/ J+ C" Q( p: A2 g" U
gen products must be considered and specific ques-0 }' t6 ]' b+ e+ |* \$ p1 W; w- L
tioning about the use of a testosterone product or* u3 k, r" \4 e& }3 c* E! e7 U
gel should be asked of the family members during
& b( x8 Q- y4 W5 h/ Mthe evaluation of any children who present with vir-
5 b/ {# u+ S* ]- O2 N! Wilization or peripheral precocious puberty. The diag-2 {% ]* y8 W* L% ^
nosis can be established by just a few tests and by
, m% y F: R% w# G6 p7 ^0 Uappropriate history. The inability to obtain such a
: `: j0 {1 M/ T1 u& M- `; }history, or failure to ask the specific questions, may8 J8 W* _4 [8 p9 H: a, K d0 X* u% ~
result in extensive, unnecessary, and expensive
7 i% A& V0 |9 g Iinvestigation. The primary care physician should be% {4 p3 T0 j8 Z/ s9 Y
aware of this fact, because most of these children
& X9 i( Y4 P/ |9 n A3 lmay initially present in their practice. The Physicians’
$ o- [+ [, F2 Y- M9 ?5 mDesk Reference and package insert should also put a
$ }: \, l8 |8 _# o9 W Gwarning about the virilizing effect on a male or3 y5 n! w4 f" Z
female child who might come in contact with some-
# V* n Z0 N; F8 q/ Bone using any of these products.1 ~3 N, o1 {7 n' Q: i
References9 l: ^* ]0 t% r7 m# f
1. Styne DM. The testes: disorder of sexual differentiation, f; r j; Y7 W1 Y) n: v7 e+ m
and puberty in the male. In: Sperling MA, ed. Pediatric4 R6 ]+ X- K. W3 e
Endocrinology. 2nd ed. Philadelphia, PA: WB Saunders;
# e3 k+ T6 e" u* z) I2002: 565-628.. w+ b1 l$ w5 x9 m* }% G4 s
2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious
# l/ z: K) Y& U" ?( T& j# [puberty in children with tumours of the suprasellar pineal |
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