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is a significant concern for physicians. Central
1 b# t3 k0 d% J- u$ D9 L# A' rprecocious puberty (CPP), which is mediated
6 y- u& d5 v, y5 \through the hypothalamic pituitary gonadal axis, has( k- {6 V8 U. F8 w8 S
a higher incidence of organic central nervous system
6 h) y6 B) C6 j, u3 O5 x: f. Y+ B$ zlesions in boys.1,2 Virilization in boys, as manifested, E; S; b7 G9 J! i( L0 |4 z
by enlargement of the penis, development of pubic
" z0 h6 t& C# r6 ^4 nhair, and facial acne without enlargement of testi-
+ l5 i6 i6 i: A5 e* A0 m1 fcles, suggests peripheral or pseudopuberty.1-3 We
. m# X3 ~. l) ]( q: Freport a 16-month-old boy who presented with the
, R' r* C i8 f- [enlargement of the phallus and pubic hair develop-
2 I7 E# N9 }- N' Wment without testicular enlargement, which was due0 Z9 b& ^( G% q& H
to the unintentional exposure to androgen gel used by
3 G& ^, s% P$ E' G9 N2 U; kthe father. The family initially concealed this infor-
3 J$ |) S9 b3 i1 P4 y( K7 tmation, resulting in an extensive work-up for this
* K: J4 X. W g9 qchild. Given the widespread and easy availability of
& \! ~& k4 G3 j# y- n+ ptestosterone gel and cream, we believe this is proba-- x& ?. {- { s! b' V: x: N
bly more common than the rare case report in the; J8 b/ ^. O7 I' V8 d* Z
literature.49 J' z5 ~. i1 S9 P
Patient Report$ R. p1 i0 ?# l) f
A 16-month-old white child was referred to the* |+ f) X! u U% ~- h+ S
endocrine clinic by his pediatrician with the concern" q- [% m* e6 n6 H# g' C" H
of early sexual development. His mother noticed
" ?$ Y5 N/ T: h' D7 _5 m6 _+ F8 {light colored pubic hair development when he was
$ Y" _$ v) T c* [From the 1Division of Pediatric Endocrinology, 2University of0 a0 z& c6 g( s- K* ]
South Alabama Medical Center, Mobile, Alabama.! A7 C' J, C$ J/ z6 q) u! Z
Address correspondence to: Samar K. Bhowmick, MD, FACE,7 g5 P& |$ W, k0 b2 y7 w# y' H
Professor of Pediatrics, University of South Alabama, College of; y: |3 y) E$ C/ G$ k0 {( Z9 W
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
( [; J0 Y0 M6 S; q F2 |, ?8 ke-mail: [email protected].
3 c: ?! E' U0 k0 n: @about 6 to 7 months old, which progressively became
2 B$ _+ J3 k' G. t1 U( u$ w& ldarker. She was also concerned about the enlarge-
' u- Q: S: a% n2 s3 o B# rment of his penis and frequent erections. The child. u# Y _' m5 m9 F0 |
was the product of a full-term normal delivery, with* N L+ i. O1 ?/ X4 A$ g7 J
a birth weight of 7 lb 14 oz, and birth length of
+ T3 ?. @0 h3 a6 ~# R& `; I$ o2 a20 inches. He was breast-fed throughout the first year" n6 q$ k- p9 X% J F
of life and was still receiving breast milk along with1 G, I" E, b) J2 H {8 l
solid food. He had no hospitalizations or surgery,
; s8 M0 j' m2 f# Vand his psychosocial and psychomotor development* q2 r* e4 I: S" K0 t& j0 U
was age appropriate.
" {. m+ b. \; c0 bThe family history was remarkable for the father,
% G; j" \" J! _* U) Y, Rwho was diagnosed with hypothyroidism at age 16,# a4 @- W, V( K0 L3 O3 E
which was treated with thyroxine. The father’s
' f" p5 V/ ]2 s6 oheight was 6 feet, and he went through a somewhat7 H0 u& T- O0 p
early puberty and had stopped growing by age 14.4 c0 R) I+ ]3 @
The father denied taking any other medication. The
+ Y# X! c4 s- I! {) o0 O6 p' Hchild’s mother was in good health. Her menarche
: l; [# J" Q7 S* `: z5 Nwas at 11 years of age, and her height was at 5 feet
3 Q* {0 c5 W" \& W2 S( y" w5 inches. There was no other family history of pre-
: g q5 Q9 |# p; `0 J0 x7 Ecocious sexual development in the first-degree rela-0 C, [0 e9 |7 w7 r" ^0 q5 G
tives. There were no siblings.
r- c6 `( x1 {; I/ r5 RPhysical Examination" H7 p9 y, z3 e5 ^
The physical examination revealed a very active,0 w, W* j) G% N6 C/ j* K( m' F
playful, and healthy boy. The vital signs documented2 |" P/ U) O- A0 Q4 O o
a blood pressure of 85/50 mm Hg, his length was9 W3 m! @' c# n6 s% ]
90 cm (>97th percentile), and his weight was 14.4 kg
2 N, N. Y9 M: Z! u4 w" U0 y(also >97th percentile). The observed yearly growth* Z9 i. R* h' O
velocity was 30 cm (12 inches). The examination of
2 F* f: D. s$ S2 ^5 d$ c. {/ Nthe neck revealed no thyroid enlargement.3 N! \# D5 X' B' M- i! J
The genitourinary examination was remarkable for3 n/ F' r* r0 J& w. l/ m3 C
enlargement of the penis, with a stretched length of- l8 b3 h0 w, i/ E
8 cm and a width of 2 cm. The glans penis was very well
( }% t$ j# y& G) ?4 Wdeveloped. The pubic hair was Tanner II, mostly around
$ Y5 Z8 Y9 m7 J6 w540
; O1 Z0 `7 ]+ V' Tat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
$ r) S" K+ O6 f1 N4 F6 y4 kthe base of the phallus and was dark and curled. The
. s* F! _7 ?% J$ stesticular volume was prepubertal at 2 mL each.5 ^9 p# U9 _2 ?5 x, K& k
The skin was moist and smooth and somewhat
, U& k" T" |$ I! f; U' N; koily. No axillary hair was noted. There were no# X8 n2 e+ X) ?6 I3 D w8 e p) [0 z' ^
abnormal skin pigmentations or café-au-lait spots.
9 X% H _+ k7 F" uNeurologic evaluation showed deep tendon reflex 2+
( S, H7 z, i9 e( c% t4 Cbilateral and symmetrical. There was no suggestion5 l7 x; V; d+ @# N/ v% [. p
of papilledema.
3 A9 A" I8 v8 E! f! ]9 k* }Laboratory Evaluation a7 n; U$ O4 q, }! v& `
The bone age was consistent with 28 months by
: {2 m1 t% R. m+ M4 Musing the standard of Greulich and Pyle at a chrono-
F; ?7 ~) J" W- Y0 Glogic age of 16 months (advanced).5 Chromosomal
, f- \8 b) s: p9 }2 kkaryotype was 46XY. The thyroid function test
3 y! D7 S# A) f: o1 N. yshowed a free T4 of 1.69 ng/dL, and thyroid stimu-
( s w4 ]$ L$ [1 Flating hormone level was 1.3 µIU/mL (both normal).6 v( ]0 L9 E h& g9 b
The concentrations of serum electrolytes, blood
' m9 U i- b2 ~4 Murea nitrogen, creatinine, and calcium all were
, v6 E% f* q' _. n S* y+ Nwithin normal range for his age. The concentration) s6 O+ o6 H6 b2 @
of serum 17-hydroxyprogesterone was 16 ng/dL' l1 D4 h; s+ u$ e9 `* R: X
(normal, 3 to 90 ng/dL), androstenedione was 201 l& j6 K& T8 J% [) q6 K" w* d, |
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
z/ y# R- S! H3 X& Uterone was 38 ng/dL (normal, 50 to 760 ng/dL),7 t5 h% \! P; m* Q0 g* T+ S
desoxycorticosterone was 4.3 ng/dL (normal, 7 to
5 F: v3 B7 q! e: M49ng/dL), 11-desoxycortisol (specific compound S)
- G' O+ E0 W. Y- zwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-1 U. q9 R$ Z, p0 k' j/ m# _
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
6 V& C) V4 Y% A; N: k: S+ Otestosterone was 60 ng/dL (normal <3 to 10 ng/dL),7 z, B. |$ k/ _ ^
and β-human chorionic gonadotropin was less than
. {) J. n7 t5 ~- z; R5 mIU/mL (normal <5 mIU/mL). Serum follicular" h, m+ x- D% E% c( Q+ ?
stimulating hormone and leuteinizing hormone1 @6 i9 ^0 d) u t3 [3 X
concentrations were less than 0.05 mIU/mL+ i: p- W9 s0 Y
(prepubertal).
" F+ T! m; A- Y: _+ H* r# zThe parents were notified about the laboratory( h, \9 W( \$ h% G4 w$ Q9 Q8 t
results and were informed that all of the tests were) O- U4 w8 S3 L; w
normal except the testosterone level was high. The
8 o6 N' V5 G$ @0 F; W# lfollow-up visit was arranged within a few weeks to
5 h; M" H: f G( H4 i' K& `obtain testicular and abdominal sonograms; how-
7 f7 b* Q( f& ?. s3 N' V/ G& h+ m+ N0 Fever, the family did not return for 4 months.
/ s I- a& { f& [( ]2 H9 K* JPhysical examination at this time revealed that the
( ?( `( w: R3 T! [4 {. cchild had grown 2.5 cm in 4 months and had gained
0 f5 C6 n+ f. K, h; Z0 J- M2 kg of weight. Physical examination remained
& _& F/ E: Y2 Z5 h6 `' ^unchanged. Surprisingly, the pubic hair almost com-3 P- L& O X" K d6 S: O! v
pletely disappeared except for a few vellous hairs at
6 @: s9 f/ n; {& m V% lthe base of the phallus. Testicular volume was still 2
! |$ N. z! B6 X9 N, [$ ^- u* amL, and the size of the penis remained unchanged.
/ D: F' B9 j& [% V# i) `The mother also said that the boy was no longer hav-. L m! K$ S9 _$ Y
ing frequent erections.2 F3 Y9 I$ [9 V L6 ]. M
Both parents were again questioned about use of
3 P$ | B) b) x7 {; i( Fany ointment/creams that they may have applied to
) a, q& b5 m8 O/ Nthe child’s skin. This time the father admitted the: M; c" e9 C! z6 b; q* I( \7 D
Topical Testosterone Exposure / Bhowmick et al 541
R4 t/ W# O6 {use of testosterone gel twice daily that he was apply-
& E" [9 o! v6 _7 R8 W% Fing over his own shoulders, chest, and back area for
0 F7 ^ [- K- @; ]& q8 a6 M/ Y2 @a year. The father also revealed he was embarrassed0 n, H6 G, x2 p: y( `
to disclose that he was using a testosterone gel pre-- }9 y: `" w, R+ [( J
scribed by his family physician for decreased libido& K* i1 U w6 w( x5 M
secondary to depression.0 Z6 C; u; D- B8 g1 y' K& m6 S! D
The child slept in the same bed with parents.
. f3 O6 u/ `+ oThe father would hug the baby and hold him on his
( X7 m# R" k& e. U( t: w$ Cchest for a considerable period of time, causing sig-
. @) T( m. X" N' L8 K8 f2 `nificant bare skin contact between baby and father.2 q3 t# a3 q, f8 \, E6 A
The father also admitted that after the phone call,
$ l1 P: h* U7 e/ n$ O5 Y$ B( Rwhen he learned the testosterone level in the baby2 ? n8 M* F/ n) D5 d
was high, he then read the product information c @4 j1 B* p% c S
packet and concluded that it was most likely the rea-
" @( l$ t2 D( }" g# [son for the child’s virilization. At that time, they
! ~* O: B u$ \( B" i* a" N' n# _decided to put the baby in a separate bed, and the
$ O3 a) I& F f1 Jfather was not hugging him with bare skin and had: F! i E8 |. C( ]
been using protective clothing. A repeat testosterone% F( |7 W) _2 _2 ~. j9 X
test was ordered, but the family did not go to the
# N) {. K9 p6 K. f- olaboratory to obtain the test./ U. t7 I8 [" U- w- x
Discussion
7 z, i' d b: `/ \Precocious puberty in boys is defined as secondary. g" Q0 U1 ^3 a* n
sexual development before 9 years of age.1,4+ m8 F) a: n6 X" E2 T- Z
Precocious puberty is termed as central (true) when
' M+ a0 F; c3 u h7 V; Tit is caused by the premature activation of hypo-
$ Y7 n: G. p# G& cthalamic pituitary gonadal axis. CPP is more com-
4 Z& ^/ r& d X1 |: ~mon in girls than in boys.1,3 Most boys with CPP7 \+ g2 Z9 S. ?" \3 v. P2 a J
may have a central nervous system lesion that is3 ^% b$ V; e) i4 ~. Q* g; h& i
responsible for the early activation of the hypothal-; }$ c" y/ S* `/ y5 w" ]6 b
amic pituitary gonadal axis.1-3 Thus, greater empha-% g0 ]6 s- J7 m9 J4 ?: k
sis has been given to neuroradiologic imaging in! l* E6 w4 R1 {$ h
boys with precocious puberty. In addition to viril-
3 w6 ]+ [) x$ i/ Dization, the clinical hallmark of CPP is the symmet-7 s7 l* |7 u8 q1 p7 Y
rical testicular growth secondary to stimulation by0 c4 I3 ~" `( ?! Y
gonadotropins.1,3
7 H+ b) e G! }& h3 PGonadotropin-independent peripheral preco-
/ Z3 ~3 k) A! w& x9 {" ^cious puberty in boys also results from inappropriate7 T# i& p1 r. m
androgenic stimulation from either endogenous or
1 }9 q( a. A$ `1 q9 C. Iexogenous sources, nonpituitary gonadotropin stim-
! [9 ^& d4 f$ [$ n' C5 Xulation, and rare activating mutations.3 Virilizing
, m* s4 Z+ [% m. _& ncongenital adrenal hyperplasia producing excessive/ g5 h* j/ |, v. ^7 R; z' T
adrenal androgens is a common cause of precocious* D: [" i, n' k ?! y
puberty in boys.3,40 \7 U1 o4 G, w% \ c# a& C
The most common form of congenital adrenal
, g: `, D% Z) n% _" V) }! A/ ahyperplasia is the 21-hydroxylase enzyme deficiency.* j% \' ?8 z4 y x3 F
The 11-β hydroxylase deficiency may also result in
) H- {5 h! s1 z C1 o' C' iexcessive adrenal androgen production, and rarely,1 U9 \4 P1 W' s7 U: X8 {" t6 V
an adrenal tumor may also cause adrenal androgen! S0 T! ^8 M( j8 N6 Z
excess.1,39 I) G' m: z m2 Y7 ^) D/ g
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
7 B3 u/ _/ k0 l) G3 P# a542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
/ m% o' }% R" y6 o& j3 D3 S" i- CA unique entity of male-limited gonadotropin-) T) x4 a- ]7 w/ m
independent precocious puberty, which is also known
) Q( A; _9 D% O6 \# Zas testotoxicosis, may cause precocious puberty at a
. T0 L6 d' Q$ N+ V" fvery young age. The physical findings in these boys
3 ]. t# m! y7 V: [8 _1 W* y6 fwith this disorder are full pubertal development,7 d5 m! z2 r8 s# e0 W% n
including bilateral testicular growth, similar to boys+ H5 F# C' j; H, F- q- t: k" t
with CPP. The gonadotropin levels in this disorder
3 S8 N2 P9 I+ [% p dare suppressed to prepubertal levels and do not show
# h' }* O |. r: Fpubertal response of gonadotropin after gonadotropin-/ Z" N) O% J* J- Y
releasing hormone stimulation. This is a sex-linked5 ?! O8 t# c$ O- X+ z# @
autosomal dominant disorder that affects only) }: h9 q9 Y, A! @( v8 }2 z% Z
males; therefore, other male members of the family* X3 x: f9 v7 O/ N2 B
may have similar precocious puberty.3
4 |& g2 W' u6 a8 ^0 |In our patient, physical examination was incon-. w8 ^' v# {& u% i( P
sistent with true precocious puberty since his testi-' o! g( o; c9 d$ V' z; |
cles were prepubertal in size. However, testotoxicosis& I8 T+ [6 X3 S D0 j/ ~# o! ]
was in the differential diagnosis because his father2 s9 i1 t! R+ I0 w6 f3 V/ r4 X2 f8 n& F
started puberty somewhat early, and occasionally,4 |: Z$ X+ J$ T- ^) k! U
testicular enlargement is not that evident in the1 l; i2 u) `& C- R- P
beginning of this process.1 In the absence of a neg-) {0 d) W: X a3 c, J+ }! Q
ative initial history of androgen exposure, our8 o# k; k' k3 W, j7 n5 K
biggest concern was virilizing adrenal hyperplasia,3 i( G3 J9 h/ Q+ v* }" ?0 X- A
either 21-hydroxylase deficiency or 11-β hydroxylase2 F: q" ^+ L0 [1 v- {
deficiency. Those diagnoses were excluded by find-
: r4 x1 w; P8 s- H) xing the normal level of adrenal steroids.
' I: O; e1 Q0 \$ _0 vThe diagnosis of exogenous androgens was strongly
' H1 f9 f' X7 s4 ?suspected in a follow-up visit after 4 months because+ C% ~# t) n( I. X7 U) \
the physical examination revealed the complete disap-, |% y- \% M v+ a
pearance of pubic hair, normal growth velocity, and+ e. K$ X( O; l6 E: v
decreased erections. The father admitted using a testos-
, G% ^+ j+ N4 [( d+ {terone gel, which he concealed at first visit. He was
R( P; [- a/ g+ kusing it rather frequently, twice a day. The Physicians’
( M( W3 o# `* l5 u: o7 P5 nDesk Reference, or package insert of this product, gel or% J0 W. z& `9 X6 I0 z- o9 e$ l- f
cream, cautions about dermal testosterone transfer to
$ d6 v2 i& t, T# R' Vunprotected females through direct skin exposure.1 C/ ~5 `. C. J/ t
Serum testosterone level was found to be 2 times the9 j6 L/ @) j% u" b
baseline value in those females who were exposed to4 L6 h, |5 M# x$ ]; p6 N/ v
even 15 minutes of direct skin contact with their male
6 V* Q( s# \9 i9 [partners.6 However, when a shirt covered the applica-
& n. j# Y) E$ T8 d D* P% I) v, `tion site, this testosterone transfer was prevented.! K( _& @! x0 l/ H; X
Our patient’s testosterone level was 60 ng/mL,* y( N/ \4 G" |9 P
which was clearly high. Some studies suggest that, Y6 X& i* \) f6 d5 C" c
dermal conversion of testosterone to dihydrotestos-
5 ?+ D! O# A* ~7 p- a* fterone, which is a more potent metabolite, is more7 _$ Q5 N! `0 F% N
active in young children exposed to testosterone
4 x/ Q$ y, l4 B% \exogenously7; however, we did not measure a dihy-
- K& G% ?( T) C3 w' Jdrotestosterone level in our patient. In addition to1 P# ]& D3 \: ]' G! z4 N5 O
virilization, exposure to exogenous testosterone in
9 F' y) a1 l6 f& n/ {children results in an increase in growth velocity and c/ ^5 ]8 L- U3 x/ C) u" a
advanced bone age, as seen in our patient. c, ~2 n9 k* u5 _5 z, N
The long-term effect of androgen exposure during, E( l& v$ e4 i
early childhood on pubertal development and final
4 R* W4 Q) m; w* G* N, E/ oadult height are not fully known and always remain; L- s1 T* i' t( j, f, `2 }, s
a concern. Children treated with short-term testos-
( E3 ~% V& _4 G( T8 Z1 iterone injection or topical androgen may exhibit some5 d$ j2 _. X& l9 `4 E- w( b! G
acceleration of the skeletal maturation; however, after
. O6 s! g: J, E0 Tcessation of treatment, the rate of bone maturation9 Z1 }3 O& g) ?8 {
decelerates and gradually returns to normal.8,9) p7 I" L" O+ b0 B6 n
There are conflicting reports and controversy3 {6 f0 z) l9 F7 j
over the effect of early androgen exposure on adult
$ g0 L+ E( r6 w' l7 upenile length.10,11 Some reports suggest subnormal% l( W$ Y9 d+ Q0 a8 s
adult penile length, apparently because of downreg-
- X! R2 k# I( [; q; R p" G6 rulation of androgen receptor number.10,12 However,
s7 z$ u4 N+ d9 bSutherland et al13 did not find a correlation between
g4 c, U' D) e* x4 {) Q' T) V% {childhood testosterone exposure and reduced adult
. [6 G1 U7 G2 upenile length in clinical studies.
/ D6 U5 p, e- HNonetheless, we do not believe our patient is1 L, P/ W) U: m% Q
going to experience any of the untoward effects from+ o4 l' U6 U1 x) t6 N
testosterone exposure as mentioned earlier because. m/ f' ?/ `8 P% a' l. d
the exposure was not for a prolonged period of time.
$ f9 C( r5 L7 e3 u" j8 hAlthough the bone age was advanced at the time of
3 I/ n0 J M8 [* g1 Zdiagnosis, the child had a normal growth velocity at6 ?. w- J* W) K r% T5 e' s
the follow-up visit. It is hoped that his final adult
l" K, {3 }/ _2 Pheight will not be affected.
) _! b7 n, d/ J/ m% fAlthough rarely reported, the widespread avail-
6 e( T F0 o( J% {! ~' dability of androgen products in our society may. V! D6 E2 v( K) G( L9 s) A' u, { f/ \
indeed cause more virilization in male or female% Z/ b! i" v- G% W. M9 ^" P
children than one would realize. Exposure to andro-
$ e/ R, H! _, Hgen products must be considered and specific ques-( F1 p' O4 H h1 B
tioning about the use of a testosterone product or2 a/ ?1 E& y) ^+ z" w- r; Z( E/ O
gel should be asked of the family members during
/ J: x( d8 c6 g1 S- Vthe evaluation of any children who present with vir-
9 P% I- G+ p i7 j6 @# lilization or peripheral precocious puberty. The diag-
. C) w) v) F2 I& E" hnosis can be established by just a few tests and by
% L/ J5 y% u" q$ E" G$ bappropriate history. The inability to obtain such a2 I+ Z+ _% }( g
history, or failure to ask the specific questions, may
" W. S8 g ~- \. Z& ?result in extensive, unnecessary, and expensive2 I" e- t( p: n% `5 [( T
investigation. The primary care physician should be
5 i3 Y) l( F( d0 Vaware of this fact, because most of these children5 i" ?8 z7 t6 V3 Z6 ], \) O9 V# b
may initially present in their practice. The Physicians’
( v6 ~) Y$ o* o$ z0 BDesk Reference and package insert should also put a
0 O9 q+ l& U0 Zwarning about the virilizing effect on a male or
9 {' J1 \4 N+ i$ O8 ffemale child who might come in contact with some-" M. @! o: e9 z/ ?9 P1 a
one using any of these products.
2 x# F V- Z& X8 k8 @2 K- ?7 BReferences
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Endocrinology. 2nd ed. Philadelphia, PA: WB Saunders;# o& h6 J$ S( O; I+ E5 p, {
2002: 565-628.- ^5 ~ Q1 ]! B
2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious
' y) N. Y8 K- r. O! ^puberty in children with tumours of the suprasellar pineal
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development in a two-year-old boy induced by topical
+ M9 a# A) l6 Cexposure to testosterone. Pediatrics. 1999;104:e23.
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Skeletal Development of the Hand and Wrist. 2nd ed.
& M" S: k+ ]8 a B; M1 ?1 z- YStanford, CA: Stanford University Press; 1959.
' a' R) h9 j0 q6 ?6. Physicians’ Desk Reference. Androgel 1% testosterone,
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7 c% }- R9 H3 e7. Klugo RC, Cerny JC. Response of micropenis to topical: A. c( z5 `3 V* J: n- O4 Q* @
testosterone and gonadotropin. J Urol. 1978;119:- W" p/ Z9 x0 i! N: h) d/ s& r- f. y
667-668., e6 w' W# o& I0 p" @
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